Light of wavelength 200.0 nm is incident on a metal plate with a threshold wavelength of 400.0 nm. what is the energy of the incident photon in electron volts?
a.
2.48 × 105 ev
c.
6.20 ev
b.
0.161 ev
d.
3.10 ev

Find the empirical formula of each of the following compounds. given mass or for each element in a sample of the compound 3,611 g ca; 6.389 g c1

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature